diff --git a/Software/Applications/Pacman/Pacman.md b/Software/Applications/Pacman/Pacman.md
index 5b4d5a6..4fd3328 100644
--- a/Software/Applications/Pacman/Pacman.md
+++ b/Software/Applications/Pacman/Pacman.md
@@ -64,6 +64,9 @@ sudo pacman -Syu
 sudo pacman -Syu
 # 或
 sudo pamac update
+# -uu：enables downgrades
+# -yy：to force a refresh even if up to date
+sudo pacman -Syyuu
 ```
 
 ## 7.从本地文件安装